- #1
rwooduk
- 762
- 59
... sound wave?
I need a simple method to calculate the impedance between water and silicone as ultrasound passes through them i.e. how much of the signal is reflected at the water silicone boundary.
The problem is I am having trouble finding the required equations, Wiki is extremely complicated (https://en.wikipedia.org/wiki/Acoustic_impedance) and other sites give an equation that doesn't include the thickness of the material (how is this possible? - please see image at end of this):
##I_{reflected} = I_{original} \frac{(Z_{1}-Z_{2})^{2}}{(Z_{1}+Z_{2})^{2}}##
My set up will be like this:
The idea of the silicone is to stop the sample from harming the transducer, also the silicone can't be in contact with the transducer as this could also cause harm to it. But I want as little as possible impedance from the silicone so I need to know how to calculate a thickness dependant impedance.
Can anyone suggest an equation that would be suited?
Thanks for any help on this.
Table showing thickness dependence of the material:
I need a simple method to calculate the impedance between water and silicone as ultrasound passes through them i.e. how much of the signal is reflected at the water silicone boundary.
The problem is I am having trouble finding the required equations, Wiki is extremely complicated (https://en.wikipedia.org/wiki/Acoustic_impedance) and other sites give an equation that doesn't include the thickness of the material (how is this possible? - please see image at end of this):
##I_{reflected} = I_{original} \frac{(Z_{1}-Z_{2})^{2}}{(Z_{1}+Z_{2})^{2}}##
My set up will be like this:
The idea of the silicone is to stop the sample from harming the transducer, also the silicone can't be in contact with the transducer as this could also cause harm to it. But I want as little as possible impedance from the silicone so I need to know how to calculate a thickness dependant impedance.
Can anyone suggest an equation that would be suited?
Thanks for any help on this.
Table showing thickness dependence of the material: